docs: def visit_Call(self, node, **kwargs):
          """
          Handles function calls within code.
  
          Function calls in Python are used to represent interface implementations
          in addition to their normal use.  If a call appears to mark an
          implementation, it gets labeled as such for Doxygen.
          """
          lineNum = node.lineno - 1
          # Function calls have one Doxygen-significant special case:  interface
          # implementations.
          match = AstWalker.__implementsRE.match(self.lines[lineNum])
          if match:
              self.lines[lineNum] = '{0}## @implements {1}{2}{0}{3}{2}'.format(
                  match.group(1), match.group(2), linesep,
                  self.lines[lineNum].rstrip())
              if self.options.debug:
                  stderr.write("# Implements {0}{1}".format(match.group(1),
                                                            linesep))
          # Visit any contained nodes.
          self.generic_visit(node, containingNodes=kwargs['containingNodes'])